Process of forming rims for tubs



July 2,193o. w. C. FORK er AL 1,771,955

raoul-:ss 6F FORMING mms Fon 'russ Original Filed Jan. 9, 1925 2 Shoots-Sheet 1 W. C. 'FORK El' Al- PnocEss oF FORMING RIMS Fon 'russ July 29, 1930.

Original' Filed Jan. 9, 1925 4 2 sheets-sheet 2 process of forming the improved rim;

Patented July 1.2.9, 1930 UNITED STATES PATENT OFFICE WILLIAM C. FORK, 0F HOMEWOOD, AND WILLIAM C. KRONQUEST, CHICAGO,

ILLINOIS, ASSIGNORS TO ACME STEEL COMPANY, 0F CHICAGO, ILLINOIS, A COB- PORATION OF ILLINOIS u PROCESSOF FORMING RIMS FOR TUBS Original application iled January 9, 1925, Serial No. 1,351. Divided and this application led Setpember 25,1926. -Serial No. 137,720.

This invention relates to an improved process of forming rims adapted for use on the covers. of4 butter tubs andI the like and the present application is a division of our copending application Serial No. 1,351, filed January 9, 1925. As heretofore constructed, butter tubs have been made of wooden staves secured in position bylmeans of hoops, and the covers of the tubs have been provided with wooden rims adapted to extend downwardly over the walls of the tubs. These Wooden rims are cylindrical in form and have a considerable vertical height so that the covers must necessarilybe packed end to end when they are being shippedfrom the manufacturer to the users of the tubs and they therefore occupy a large amount of space. It is the principal object of the present invention to provide an'improved process for manufacturing a metallic rim for vuse on the covers of butter tubs. A` further important object is to provide an improved process by which the improved rim may be conveniently 'and cheaply formed from sheet metal. Still another object is to provide a process of forming a rim whereby the rims, when applied tothetub covers, will permit a large number of covers to be nested one Within the other to form a compact package. A furtherv object is to provide a yprocess of forming a rim whereby the body of the rim is given a fiared formation while, at the same time, great strength is imparted to the rim so that it may be conveniently packed and efficiently used. .Otherf objects relate to various features of the process such as will appear more fully hereinafter.`

The nature of the invention will be understood from the following specification takenl with the accompanying drawings in which Ione method of forming the rim and one form of the construction thereof are disclosed. In the drawings, Figure 1 shows a somewhat diagrammatic side elevation of a form of apparatus which'may be employed in the Fi 2 shows an enlarged sie.; elevation of a pois'- tion of the sheet metal band which is formed by the first step of the process; Fig. 3 is an enlarged `vertical section taken on the line 3-3 of Fig. 1 showing the formation of the peripheral surfaces of the rolls which operate on the'sheet metal band after it has been formed as' illustrated in Fig. 2; Fig. 4

shows an enlarged sectional view taken on ,the sheet metal band is corrugated and given a flared formation; Fig. 6 is an enlarged perspective `view of a portion of the completed rim; Fig. 7is a perspective view of the complete -rim in its fnishedform; Fig. 8 is an enlarged vertical section taken through the axis of a butter tub illustrating the apI plication of the improved rim thereto; Fig. 9 is a side elevation of a package of butter tub rims showing the nested relation thereof, a part ofthe package being shown in vertical section; and Fig. 10 shows a perspective view of a butter tub having the improved rim of the present invention applied to the.

cover thereof.

In practicing the invention, it is desirable to form the rim from a band of sheet metal lwhich is relatively thin in order that the completed rim may be manufactured at a relatively low cost to enable it to compete with the wooden rims heretofore used. Various forms of apparatus may be employed in practicing the improved process, but, by way of illustration, there is shown in Fig. 1 a diagrammatic view of a series of rolls and cooperating apparatus which ma `be a modification of the form of hoo making a p aratus disclosed in U. S. Patent o. 1,508,53 0', dated September 16, 1924. 'In the operation of this apparatus, a band 15 of sheet metal of suitable width and thinness is fed from a roll by means ofl suitable power driven feeding rollers, not shown, onto a table or guideway 16. The sheet metall band 15 is intermittently brought to rest on the guideway 16 and it is then operated on by a pair of downwardl moving plungers 17 and 18, the plunger 1 carrying a knife 19` and a unch 20, while the plunger 18 carries adpunc 21 and a knife 22. The knife 19 cooperates with a cutting edge 23 on the guideway 16 to sever the band 15 along the line 24, as Shown in Fig. 2, thus severing a strip 25 of sheet metal which is of suitable length `for forming the butter tub rim. The knife 19 is of such form that the severed edge`24 is curved adjacent one side of the strip 25 as shown at 24, thus leaving at the end of the body portion of the band 15 a sharp projection 26. This projection is cut from the end of the strip 25 by the knife 22 cooperating with the cutting edge 27 on the guideway 16. At the same time that the strip 25 is severed from the band 15 and the projection 26 is cut from the end of the strip, to form a rounded surface 26a, the punches 20 and 21- operate to form in the strip 25 two holes 28 and 29located adjacent theends of the strip for engagement by nails or tacks when the rim is applied to the coverof the butter tub. After the strip 25 has been formed, it is fed longitudinally of the table 16 by rollers 30, this feeding operation occurring after the plungers 17 and 18 have been elevated, and the strip 25 is thereby caused to pass between two rolls 31 which are mounted on horizontal axes and arranged to coact with the strip 25 to impart to it the form illustrated in Fig. 3, where the strip 25 is shown as having a half-bead 32 ofsubstantially semi-circular cross section at one edge thereof, while the 'other edge is bent transversely to form a flange'34. The half-bead 32 is formed by a projection 35 on one of the rolls 31 engaging the sheet metal of the band and forcing it into al depression 36 of similar formation formed in the other roll 31. The flange 34 is formed by the shoulder 37 on one of the rolls 31 overlapping the periphery of the other roll 31. After passing the rolls 31, the strip of sheet metal, having the cross section illustrated in Fig. 3, is operated on by a pair of corrugated rolls 38, mounted to revolve on vertical axes and arranged to operate only on the flange 34 of the strip so that this strip is corrugated, as indicated in 4, during the passage of the strip between these rolls, the aXes of these corrugations 39 extending transversely to the edge of the flange. The fhinness of the sheet metal permits it to stretch sufliciently dur' ing the process of corrugation of the flange 34 Without buckling or warping the body portion 40 of the strip of sheet metal between the flange 34 and the half-bead 32, this bodyl portion having a width considerably greater than that of the-flange 34.

After the'flange 34 has been-corrugated, the strip 25 is engaged by a-pairof rolls 41 which are mounted to revolve onhorizontal axes and which are provided on their peripheral surfaces with corrugations 42. The corrugations may be tapered transversely of the rolls or the axes of the rolls 41 may be relativelyinclined to a slight extent so that the rolls l41 produce in the body portion 40 of the strip 25 a continuous series of corrugations 43 which decrease in depth from the corrugated flange 34 toward the half-bead 32, preferably disappearing entirely before the half-bead 32 is reached, as illust-rated in Fig.

6. In the process of forming the tapered corrugations 43, the strip of sheet metal is contracted along and toward the edge on which the corrugated flange 34 is formed so that the body portion of the sheet metal rim between the bead 32 and the flange 34 is flared outwardly from the corrugated flange, as illustrated in Fig. 7. The previous formation and corrugation of the flange 34 makes it possible to form the tapered corrugations 43 without stretching the metal and without buckling the flange 34 because the corrugations in the flange 34 lend themselves to the contraction of that edge of the rim on which this flange is formed. The corrugating rolls 41 force the metal strip 25 upwardly over the concave face of a die block 44 thus imparting to the strip the circular curvature of the completed rim 45, having the form shown in Fig. 7. The provision of corrugations in the flange 34 and in the body portion of the rim results in imparting great strength to the finished rim and also in giving it a flared formation which permits the nesting of the completed rims one within the other after they have been applied to the covers.

As shown in Figs. 8, 9 and 10, the rim 45 is applied to the wooden butter tub cover 46 with the corrugated flange 34V overlying the upper surface of the cover and with the flared body portion 40 seated against the correspondingly flared edge surface 46a of the cover. The rim is secured to the cover by small nails or staples 47 which are driven 'through the body portion 40 of the rim into the edge of the cover, as shown in Fig. 10. The overlapping ends of the rim are united by a nail or staples 48 driven through the holes 29 into the cover, or the holes 29 may be formed by the driving of the nail or staple, a method which eliminates the difficulty 'of securing an alignment of previously formed holes when the ends of the rim are overlapped.

The nested arrangement of the completed rims is illustrated in Fig. 9 wherea series of rims 45 are shown applied to the covers 46 and mounted one, within the other with the flanges 34 extending inwardly and the half-beads 32 located one above the other on the outer side of the package. In securing the covers together in the nested package, wooden blocks 49 may be mounted .within the rims, resting on the upper cover 46, and sheet metal straps 50 may bepassed around the package and secured to the blocks 49 by nails 51.

The user of the covers applies them to the responding to that of the external surface of the tub. When the cover is placed on the tub the rim 45 projects downwardly over the'upper edge of the tub, thus' preventing access of moisture and dust to the interior of the tub through the crack between the cover and the upper ends of the staves 54.

It will be apparent that by means of the foregoing process, an improved sheet metal rim has een provided which may be manufactured at asufiiciently low cost and which possesses sufficient strength 4to compete successfully with other types of rims heretofore used. Not only does the improved rim possess increased strength and stiffness but it has a desirable flared formation which permits large numbers of them to be nested in a compact package for shipment. v Although one embodiment of the improved process o forming rims has been shown and described by way understood that the method of the present invention may be practiced in various ways lwithin the scope of the appended claims.

We claim:

1. vThe process of forming a rim for a cover which consists in cutting a strip of thin sheet-metal, stifl'ening'one edge of said strip by forming a' flange thereon, corrugatingy the body portion of said strip transversely between said flange and the other edge of said strip without stretching the metal of said body portion, and imparting a substantially circular curvature to said'strip in a plane, extending transversely to said body portion.

2. The process of forming a rim for a cover which consists in cuttin a strip of sheetmetal, forming a flange a ong one edge thereof, and contracting the edge portion adjacent said flange to impart a flare to the rim, whereby a plurality of rims may be nested one within the other.

- 3. .The process of forming a rim for a cover which consists in cutting a strip ofv sheet-metal, forming an annular transverse flange along one edge thereof, corrugating said flange, and then corrugating the body portion of 4said rim to contract 1t adjacent said flange.

4. The process of forming a rim for a cover which consists in cutting a strip of sheetmetal, forming a corrugated transversely exof illustration, it will be tending flange along one edge thereof,` and forming a bead alon the other edge thereof.

5. The process o forming a rim for a cover which consists in cutting a strip of sheet-metal, forming a flange along one edge thereof, forming a bead along the other edge thereof, and then corrugating the body portion of said strip between said bead and said flange. f p

6. The process of forming a rim for a. cover which consists in cutting-a strip.- of sheet-metal, forming a corrugated transverse flange along one edge thereof, and then corrugating the body portion of the strip to .impart a flare thereto.

7. The process of forming a rim which consists in cutting a strip of sheet-metal, then forming a flange along one edge of said strip,

and then imparting a flare to the body portion of said strip by forming corrugations therein'with the axes of the corrugations extending transversely of the strip, said corrugations being taperedl longitudinally yof their axes.

I 8. The process of forming a rim for a cover which consists inl cutting a strip of sheetmetal, forming a transverse flange along the edge of said strip, corrugating said flange, and then corrugating the body portion of said` strip adjacent said flange to cause said body portion to flare outwardly from said flange.

9. The process of forming a rim for a cover which consists in cutting a strip of sheetmetal, forming a transverse flange along the edge of said strip, corrugatingsaid flange with the axes of said corrugations extending transversely to th'e edge of said flange, and then corrugating the body portion of said strip adjacent said flange to cause said body portion to flare outwardly from said flange, and then bending said strip into circular form.

10. The process of forming a rim for a cover which consists in supplying a band of sheet metal', cutting a strip of metal therefrom, feeding said strip through dies to form a transverse flange alongl one edge thereof, then corrugating said flange with the corrugations extending transversely thereof, then corrugating the body portion of said strip adjacent said llange to contract said strip adjacent said flange and to form a flare outwardly from said flange, and then feeding said strip over a die to bend it into circular form.

11. The process of forming a. rim for a cover which consists in cutting a strip of sheet metal from a source of supply and forming rounded edges on the ends thereof, simultaneously punch-ing the ends of said strip, feeding said strip through dies to form a transverse flange along one edge thereof and a bead along the other edge thereof, then feed- 4ing said strip between rolls to formcorrugations in said flange extending transversely tothe edge ofsaid ange, then feeding said strip through other rolls to form corrugations in the body portion thereof Without stretching the metal of said strip and to cause the body portion of said strip to flare away from said flange, and then feeding said strip over a die to curve it into circular form.

l2. The process of forming a rim for a cover which consists in feeding a strip of metal through dies to form a transverse flange along one edge thereof, then corrugating said ange with the corrugations extending transversely thereof, then corrugating l the body portion of said strip adjacent said flange to l 5 voutract said strip adjacent said {iange and to form a flare outwardly from said flange, and feeding said strip over a die to bend it into circular form.

In testimony whereof, We have subscribed our names.

WILLIAM C. FORK. g WILLIAM C. KRONQUEST.

ISU 

